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<FONT color="green">001</FONT>    // Copyright 2006-2007 Regents of the University of California.  May be used <a name="line.1"></a>
<FONT color="green">002</FONT>    // under the terms of the revised BSD license.  See LICENSING for details.<a name="line.2"></a>
<FONT color="green">003</FONT>    package org.joe_e.charset;<a name="line.3"></a>
<FONT color="green">004</FONT>    <a name="line.4"></a>
<FONT color="green">005</FONT>    import java.nio.charset.Charset;<a name="line.5"></a>
<FONT color="green">006</FONT>    import java.nio.ByteBuffer;<a name="line.6"></a>
<FONT color="green">007</FONT>    import java.io.InputStream;<a name="line.7"></a>
<FONT color="green">008</FONT>    import java.io.InputStreamReader;<a name="line.8"></a>
<FONT color="green">009</FONT>    import java.io.OutputStream;<a name="line.9"></a>
<FONT color="green">010</FONT>    import java.io.OutputStreamWriter;<a name="line.10"></a>
<FONT color="green">011</FONT>    import java.io.Reader;<a name="line.11"></a>
<FONT color="green">012</FONT>    import java.io.Writer;<a name="line.12"></a>
<FONT color="green">013</FONT>    <a name="line.13"></a>
<FONT color="green">014</FONT>    /**<a name="line.14"></a>
<FONT color="green">015</FONT>     * UTF-8 I/O.<a name="line.15"></a>
<FONT color="green">016</FONT>     */<a name="line.16"></a>
<FONT color="green">017</FONT>    public final class UTF8 {<a name="line.17"></a>
<FONT color="green">018</FONT>        private static final Charset charset = Charset.forName("UTF-8");<a name="line.18"></a>
<FONT color="green">019</FONT>        <a name="line.19"></a>
<FONT color="green">020</FONT>        private UTF8() {}<a name="line.20"></a>
<FONT color="green">021</FONT>        <a name="line.21"></a>
<FONT color="green">022</FONT>        /**<a name="line.22"></a>
<FONT color="green">023</FONT>         * Encodes a string in UTF-8.<a name="line.23"></a>
<FONT color="green">024</FONT>         * @param text  The text to encode.<a name="line.24"></a>
<FONT color="green">025</FONT>         * @return The UTF-8 bytes.<a name="line.25"></a>
<FONT color="green">026</FONT>         */<a name="line.26"></a>
<FONT color="green">027</FONT>        static public byte[] encode(final String text) {<a name="line.27"></a>
<FONT color="green">028</FONT>            final ByteBuffer bytes = charset.encode(text);<a name="line.28"></a>
<FONT color="green">029</FONT>            final int len = bytes.limit();<a name="line.29"></a>
<FONT color="green">030</FONT>            final byte[] v = bytes.array();<a name="line.30"></a>
<FONT color="green">031</FONT>            if (len == v.length) { return v; }<a name="line.31"></a>
<FONT color="green">032</FONT>            final byte[] r = new byte[len];<a name="line.32"></a>
<FONT color="green">033</FONT>            System.arraycopy(v, bytes.arrayOffset(), r, 0, len);<a name="line.33"></a>
<FONT color="green">034</FONT>            return r;<a name="line.34"></a>
<FONT color="green">035</FONT>        }<a name="line.35"></a>
<FONT color="green">036</FONT>        <a name="line.36"></a>
<FONT color="green">037</FONT>        /**<a name="line.37"></a>
<FONT color="green">038</FONT>         * Decodes a UTF-8 string. Each byte not corresponding to a UTF-8<a name="line.38"></a>
<FONT color="green">039</FONT>         * character decodes to the Unicode replacement character U+FFFD.<a name="line.39"></a>
<FONT color="green">040</FONT>         * Note that an initial byte-order mark is not stripped.  This method is<a name="line.40"></a>
<FONT color="green">041</FONT>         * equivalent to &lt;code&gt;decode(buffer, 0, buffer.length)&lt;/code&gt;.<a name="line.41"></a>
<FONT color="green">042</FONT>         * @param buffer    the ASCII-encoded string to decode<a name="line.42"></a>
<FONT color="green">043</FONT>         * @return The corresponding string<a name="line.43"></a>
<FONT color="green">044</FONT>         * @throws java.lang.IndexOutOfBoundsException<a name="line.44"></a>
<FONT color="green">045</FONT>         */<a name="line.45"></a>
<FONT color="green">046</FONT>        static public String decode(byte[] buffer) {<a name="line.46"></a>
<FONT color="green">047</FONT>            return decode(buffer, 0, buffer.length);<a name="line.47"></a>
<FONT color="green">048</FONT>        }<a name="line.48"></a>
<FONT color="green">049</FONT>        <a name="line.49"></a>
<FONT color="green">050</FONT>        /**<a name="line.50"></a>
<FONT color="green">051</FONT>         * Decodes a UTF-8 string. Each byte not corresponding to a UTF-8<a name="line.51"></a>
<FONT color="green">052</FONT>         * character decodes to the Unicode replacement character U+FFFD.<a name="line.52"></a>
<FONT color="green">053</FONT>         * Note that an initial byte-order mark is not stripped.<a name="line.53"></a>
<FONT color="green">054</FONT>         * @param buffer    the ASCII-encoded string to decode<a name="line.54"></a>
<FONT color="green">055</FONT>         * @param off       where to start decoding<a name="line.55"></a>
<FONT color="green">056</FONT>         * @param len       how many bytes to decode<a name="line.56"></a>
<FONT color="green">057</FONT>         * @return The corresponding string<a name="line.57"></a>
<FONT color="green">058</FONT>         * @throws java.lang.IndexOutOfBoundsException<a name="line.58"></a>
<FONT color="green">059</FONT>         */<a name="line.59"></a>
<FONT color="green">060</FONT>        static public String decode(byte[] buffer, int off, int len) {<a name="line.60"></a>
<FONT color="green">061</FONT>            return charset.decode(ByteBuffer.wrap(buffer, off, len)).toString();<a name="line.61"></a>
<FONT color="green">062</FONT>        }<a name="line.62"></a>
<FONT color="green">063</FONT>        <a name="line.63"></a>
<FONT color="green">064</FONT>        /**<a name="line.64"></a>
<FONT color="green">065</FONT>         * Constructs a UTF-8 reader.<a name="line.65"></a>
<FONT color="green">066</FONT>         * @param in    The binary input stream.<a name="line.66"></a>
<FONT color="green">067</FONT>         */<a name="line.67"></a>
<FONT color="green">068</FONT>        static public Reader input(final InputStream in) {<a name="line.68"></a>
<FONT color="green">069</FONT>            return new InputStreamReader(in, charset);<a name="line.69"></a>
<FONT color="green">070</FONT>        }<a name="line.70"></a>
<FONT color="green">071</FONT>        <a name="line.71"></a>
<FONT color="green">072</FONT>        /**<a name="line.72"></a>
<FONT color="green">073</FONT>         * Constructs a UTF-8 writer.<a name="line.73"></a>
<FONT color="green">074</FONT>         * @param out   The binary output stream.<a name="line.74"></a>
<FONT color="green">075</FONT>         */<a name="line.75"></a>
<FONT color="green">076</FONT>        static public Writer output(final OutputStream out) {<a name="line.76"></a>
<FONT color="green">077</FONT>            return new OutputStreamWriter(out, charset);<a name="line.77"></a>
<FONT color="green">078</FONT>        }<a name="line.78"></a>
<FONT color="green">079</FONT>    }<a name="line.79"></a>




























































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